I remember being in some huge gym, and climbing up this wall along a chain. This thing had to be at least 40 feet high. I was supposed to get all the way to the top to a window ledge, and then shimmy from it to the next window ledge. i got all the way up to the top, and started thinking "what if I run out of strength". Then everything else started pouring through my mind. How can I get down quickly with out falling, will I even make it down, would making across just be easier...etc etc etc. My heart started racing, and I felt my blood pressure rising...all of a sudden I'm back on the ground. I started explaining all of this to someone in a FA, and then I found myself running through irradiated soil in bare feet. There are other parts of the dream I'd rather not mention or remember.